Fourdrinier machine



E. J. MCDONNELL FOURDRINIER MACHINE Filed Deo. 2o, 1950 3 sheetsLsheet May 3, 1932.A

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Patented May 3, 1932 PATENT OFFICE EDWARD J'. MCDONNELL, 0F GROVETON, NEW HAMPSHIRE FOURDRINIER MACHINE Application iiled December 20, 1930. Serial No. 503,722.

The invention relates to Fourdrinier machines and especially to that portion of the machine having the paper-making wire which is subjected to shake. v

l@ In the formation of paper on the Fourdrinier wire or paper-making wire subjected to a wire shake, the interlacing of the fibres takes place while the fibres are held in suspension in water, and in securing a well 1Q formed paper it is always desirable to keep the fibres under the iniiuence of the wire shake when in suspension in the water as far down the wire as possible before the felting takes place, for otherwise a poorly formed sheet `IIS' of paper is obtained.

Stock varies in its capability of retaining water. Hydrated stock in which the fibres have been well beaten in the beating engines possess properties by which they will retain the water and carry it well down the wire before the water is discharged. On the other hand, non-hydrated stock, which has been subjected to but little or no beating in the beating engines, as for example stock for making blotting, saturating and absorbent papers, will not retain the water, but discharge it so freely-as to make it practically impossible to obtain a well formed sheet of paper owing to the limited period within which the bres have been subjected to the wire shake.

Heretofore with fibres which freely discharge the water it has been common practice to add additional water to the stock going onto the wire in an effort to have the water carry the fibres further down the wire while under the iniiuence of the wire shake, but this is objectionable for thel reason that it exerts such disturbing iniiuence as to make waves and currents causing an uneven stock formation, which is very undesirable.

The object of the invention is to provide means whereby the bres will carry, when suspended in water, a suiiicient distance down the wire to obtain a proper sheet formation, and this without the additionl of water to the normal stock.

The invention can best be seen and understood by reference to the drawings in which 50 such portion of a Fourdrinier machine is shown as is necessary to a proper understanding of the invention, and in which- Figure 1 is a plan of the mechanism to which the invention pertains.

F'Fig.` 2 is a section on the line 2-2 of 55 Fig. 3 is a section on the line 3-3 of Fig. 2. Fig. 4. is a lplan of a'modiied detail of construction, an l Fig. 5 is a section on the line 5-5 of Fig. 4; 90

Referring to the drawings:

1 represents the Fourdr'inier-wire or papermaking Wire; 2 the breast roll around which the wire passes, and 3 rolls assisting in the support of the :wire which is otherwise supported, driven, and shaken in the usual manner. 4 is a portion of one of the suction boxes. 5 is a plate over which the stock is directed to flow onto the wire, and 6 the splice. 'm

4The invention, as will now be explained, pertains to a means for preventing, limiting or otherwise controlling the drainage of' water from the stock within that portion of the running wire lying between the point where the stock is first discharged onto the wire and the suction boxes. Arranged beneathv this portion of the wire is a-line'of boards 7, parallelly arranged, with'extension crosswise the wire, and all combining to form an extended table. The boards are preferably rectangular in form and in practice are of wood, maple being. preferred. The wire slides over the top surfaces of these -boards and when the boards are movedvtogether with abutting edges, water is prevented from draining through the wire and is retained in the stock. Accordingly the iibres remain in water suspension and are subjected to the influence of the wire shake. By varying the distance by which the boards are-separated from one another the discharge of water from the stock may be controlled. Thus the fibres in the stock may be carried down the wire for any determinate length of carry, and the fibres remain in suspension," the water being gradually drained away as may be desired.

Theboards 7 are supported and adjustably i controlled with relation to one another in the following manner: Secured to bars 8 extend-l lng along either side of the machine are hangers 9 supporting side rails 10. The boards are supported by, and adjustable on these side rails. Each of the boards is borne by a preferably T-shaped metal carrier 11 of Which 12 represents the head of the carrier to which the board is secured, and 13 its shank. The head of the carrier is extended at either end beyond the shank and secured to these projecting ends of the head are blocks 14 which project downward alongside the ends of the shank and rest upon the side rails 10, being slidable thereon. For preventing endwise displacement of the boards and carriers the Shanks of the carriers are preferably of suiiicient length to extend below the top edge of the side rails and lie between these rails.

For securing the adjustment of the boards with relation to one another there is secured to the top surface of the side rails just outside the blocks 14 racks 15. These racks will assist in preventing lateral displacement of the boards and thelr carriers by the bearing of the blocks 14 against the racks. Traveling on the racks 15, respectively, are toothed wheels 16. The wheels are borne by a common connectino` axle rod 17 to which the wheels are fixedly secured. These rods pass loosely through eyes 18 secured to the ends of the block. Accordingly as the toothed wheels are moved on the racks the carriers and boards carried by them will be adjusted with relation to one another and moved into abutting contact, closing all space between them,.or to any graduated separation depending upon the positioning of the wheels. The set of wheels 16 for each board are turned by extending their connecting rod 17 beyond the wheels to which the rod is secured. The ends 19 of the rod so extended are squared or otherwise fitted to receive a tool or key 20 by which the set of wheels are turned and by such turning adjustably positioning the board. Access is had to the ends of the rod through the hangers 9 by means of openings 21 in the hangers.

-In Figs. 4 and 5 a modiied arrangement is shown in that rolls 20 are employed in place of boards. Blocks 14 are employed resting and slidable upon the wire the same as the blocks 14 in the construction first described. The rolls are arranged to turn by any suitable ball bearing connection (not shown) on rods 23 extendin through the rolls, and the ends of these ro s rest in slots 24 cut in the tops of the blocks. The blocks together with the rolls borne by them are adj ustably positioned the same as the boards in the construction first described. Practice has demonstrated that rolls are not so ei'ective as boards. While the water will ill the spaces between the rolls and so prevent further water drainage through the wire, especially when the rolls are in contact or very slightly out of contact, yet the turning of the rolls tends to produce a slight agitation in the water which is transmitted to the stock and is objectionable on this account.- When boards are used boxes, the remaining space being taken up` by ordinary rolls which assist in the support of the wire. With the Fourdrinier wire having a running space of seventy feet between the point where the stock is first fed onto the wire and the suction boxes eight 8 inch boards will generally be found suiiicient, although practice will better demonstrate the number of boards to be employed.

Having thus fully described m invention, I claim and desire to secure by getters Patent of the UnitedStates 1. In a Fourdrinier machine having a paper-making wire, the combination therewith of a series of members arranged to form an extended table beneath the wire and over which the wire passes, said members forming the table being adjustable with relation to one another to either close or leave a determinate o ening between adjacent ones of said mem ers forming the table whereby the discharge of water from the stock after its entry onto the wire will be controlled, and jneans for adjustably positioning said memers.

2. In a Fourdrinier machine having a paper-making wire, the combination therewith of a serles of boards arranged to form an extended table beneath the wire and over which the wire passes, said boards being adjustable to either close or leave a determinate opening between adjacent ones of said boards whereby the discharge of water from said Astock after entry onto the wire will be controlled, and means for adjustably positioning said boards.

3. In a Fourdrinier machine having a paper-makin wire, the combination therewith of a series of rolls arranged to form an extended table beneath the wire and over which the wire passes, said rolls being adjustable to either close or leave a determinate opening between adjacent ones of said rolls whereby the discharge of water from said stock after entry onto the wire will be concontrolled, and means for adjustably positioning said rolls.

4. In a Fourdrinier machine having a paper-making wire, the combination therewith of a series of members arranged beneath the wire and adjustable to either close or leave a determinate opening between adjacent ones of said members whereby the discharge of water from the stock after its entry onto the wire will be controlled, and

means for adjustably positionin said members comprislng rails supporte to extend along the sides of the machine, racks on said rails, toothed` wheels traveling on said racks in sets corresponding with the number of said members, and means connectin said sets of Wheels to the individual mem ers whereby said members will be adjustably positioned with relation to oneanother as the wheels are turned. EDWARD J. MCDONN ELL. 

